Table 3. — Action of B. salmonicida on solidified serum with respect to 

 Eravrth, liquefaction, gas and pigment production 



Authority 



GroTivth 



Liquefaction 



and gas 

 production 



Pigment production 



Harsh (1903). 



Visible grotrth in 

 18 hours. After 

 11 days it be- 

 came slow. 



Arkwright (1912). Grew readily. 



Mettam (19U). 



Williamson 

 (1928). 



Grew readily. 

 Grovrth. 



Evident lique- 

 faction on second 

 day. 



Slow liquefac- 

 tion in 7 to 14 

 days. 



Liquefaction. 



Slow liquefac- 

 tion on Loeffler'i 

 serum. 



A marked brown 

 color after 3 to 

 A days. Dark 

 brown after about 

 11 days. 



Medium became deep 

 brown in 7 to 14, 

 days. 



Pigment production. 



Pigment production. 



Stevens and Keil 

 (1931). 



Rich grovrth in 

 24 hours. 



After seventh day 

 gradual liquefac- 

 tion on Loeffler's 



Pigment on sixth 

 day. 



Duff and Stewart 

 (1933). 



Complete lique- 

 faction in 6 to 

 10 days. Gas 

 sometimes noted. 



Much pigment. 



16 



